A part that measures right can still fail on its surface. Finish and edge condition decide sealing, friction, cleanliness and fatigue life.
Surface finish down to Ra 0.2 µm is achievable. The number a part reaches depends on material, tooling and cutting parameters — a fine finish is produced deliberately, not as a side effect.
Burrs are removed with a strategy chosen for the part: in-process edge control plus controlled deburring, and cryogenic (dry-ice) deburring where thin walls or fine internal features would be damaged by abrasive tumbling.
Surface and edge condition are checked as part of inspection; where a drawing specifies a roughness value, it is measured rather than assumed.